diff --git a/javascript/ql/lib/change-notes/2025-03-13-unescape.md b/javascript/ql/lib/change-notes/2025-03-13-unescape.md
new file mode 100644
index 000000000000..aa2d445118cb
--- /dev/null
+++ b/javascript/ql/lib/change-notes/2025-03-13-unescape.md
@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* Added taint-steps for `unescape()`.
diff --git a/javascript/ql/lib/semmle/javascript/dataflow/TaintTracking.qll b/javascript/ql/lib/semmle/javascript/dataflow/TaintTracking.qll
index 0d378a32bc5c..2dd1f622fb5b 100644
--- a/javascript/ql/lib/semmle/javascript/dataflow/TaintTracking.qll
+++ b/javascript/ql/lib/semmle/javascript/dataflow/TaintTracking.qll
@@ -494,7 +494,7 @@ module TaintTracking {
           succ = c and
           c =
             DataFlow::globalVarRef([
-                "encodeURI", "decodeURI", "encodeURIComponent", "decodeURIComponent"
+                "encodeURI", "decodeURI", "encodeURIComponent", "decodeURIComponent", "unescape"
               ]).getACall() and
           pred = c.getArgument(0)
         )
diff --git a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/Xss.expected b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/Xss.expected
index 2e72b292f72d..7de1561f79e8 100644
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/Xss.expected
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/Xss.expected
@@ -223,6 +223,7 @@
 | tst.js:477:18:477:40 | locatio ... bstr(1) | tst.js:477:18:477:30 | location.hash | tst.js:477:18:477:40 | locatio ... bstr(1) | Cross-site scripting vulnerability due to $@. | tst.js:477:18:477:30 | location.hash | user-provided value |
 | tst.js:484:33:484:63 | decodeU ... n.hash) | tst.js:484:43:484:62 | window.location.hash | tst.js:484:33:484:63 | decodeU ... n.hash) | Cross-site scripting vulnerability due to $@. | tst.js:484:43:484:62 | window.location.hash | user-provided value |
 | tst.js:492:18:492:54 | target. ... "), '') | tst.js:491:16:491:39 | documen ... .search | tst.js:492:18:492:54 | target. ... "), '') | Cross-site scripting vulnerability due to $@. | tst.js:491:16:491:39 | documen ... .search | user-provided value |
+| tst.js:499:18:499:33 | unescape(source) | tst.js:498:16:498:26 | window.name | tst.js:499:18:499:33 | unescape(source) | Cross-site scripting vulnerability due to $@. | tst.js:498:16:498:26 | window.name | user-provided value |
 | typeahead.js:25:18:25:20 | val | typeahead.js:20:22:20:45 | documen ... .search | typeahead.js:25:18:25:20 | val | Cross-site scripting vulnerability due to $@. | typeahead.js:20:22:20:45 | documen ... .search | user-provided value |
 | v-html.vue:2:8:2:23 | v-html=tainted | v-html.vue:6:42:6:58 | document.location | v-html.vue:2:8:2:23 | v-html=tainted | Cross-site scripting vulnerability due to $@. | v-html.vue:6:42:6:58 | document.location | user-provided value |
 | various-concat-obfuscations.js:4:4:4:31 | "<div>" ... </div>" | various-concat-obfuscations.js:2:16:2:39 | documen ... .search | various-concat-obfuscations.js:4:4:4:31 | "<div>" ... </div>" | Cross-site scripting vulnerability due to $@. | various-concat-obfuscations.js:2:16:2:39 | documen ... .search | user-provided value |
@@ -745,6 +746,9 @@ edges
 | tst.js:491:7:491:39 | target | tst.js:492:18:492:23 | target | provenance |  |
 | tst.js:491:16:491:39 | documen ... .search | tst.js:491:7:491:39 | target | provenance |  |
 | tst.js:492:18:492:23 | target | tst.js:492:18:492:54 | target. ... "), '') | provenance |  |
+| tst.js:498:7:498:26 | source | tst.js:499:27:499:32 | source | provenance |  |
+| tst.js:498:16:498:26 | window.name | tst.js:498:7:498:26 | source | provenance |  |
+| tst.js:499:27:499:32 | source | tst.js:499:18:499:33 | unescape(source) | provenance |  |
 | typeahead.js:20:13:20:45 | target | typeahead.js:21:12:21:17 | target | provenance |  |
 | typeahead.js:20:22:20:45 | documen ... .search | typeahead.js:20:13:20:45 | target | provenance |  |
 | typeahead.js:21:12:21:17 | target | typeahead.js:24:30:24:32 | val | provenance |  |
@@ -1397,6 +1401,10 @@ nodes
 | tst.js:491:16:491:39 | documen ... .search | semmle.label | documen ... .search |
 | tst.js:492:18:492:23 | target | semmle.label | target |
 | tst.js:492:18:492:54 | target. ... "), '') | semmle.label | target. ... "), '') |
+| tst.js:498:7:498:26 | source | semmle.label | source |
+| tst.js:498:16:498:26 | window.name | semmle.label | window.name |
+| tst.js:499:18:499:33 | unescape(source) | semmle.label | unescape(source) |
+| tst.js:499:27:499:32 | source | semmle.label | source |
 | typeahead.js:20:13:20:45 | target | semmle.label | target |
 | typeahead.js:20:22:20:45 | documen ... .search | semmle.label | documen ... .search |
 | typeahead.js:21:12:21:17 | target | semmle.label | target |
diff --git a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/XssWithAdditionalSources.expected b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/XssWithAdditionalSources.expected
index 132189a22f36..eb961fc83dbf 100644
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/XssWithAdditionalSources.expected
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/XssWithAdditionalSources.expected
@@ -607,6 +607,10 @@ nodes
 | tst.js:491:16:491:39 | documen ... .search | semmle.label | documen ... .search |
 | tst.js:492:18:492:23 | target | semmle.label | target |
 | tst.js:492:18:492:54 | target. ... "), '') | semmle.label | target. ... "), '') |
+| tst.js:498:7:498:26 | source | semmle.label | source |
+| tst.js:498:16:498:26 | window.name | semmle.label | window.name |
+| tst.js:499:18:499:33 | unescape(source) | semmle.label | unescape(source) |
+| tst.js:499:27:499:32 | source | semmle.label | source |
 | typeahead.js:9:28:9:30 | loc | semmle.label | loc |
 | typeahead.js:10:16:10:18 | loc | semmle.label | loc |
 | typeahead.js:20:13:20:45 | target | semmle.label | target |
@@ -1186,6 +1190,9 @@ edges
 | tst.js:491:7:491:39 | target | tst.js:492:18:492:23 | target | provenance |  |
 | tst.js:491:16:491:39 | documen ... .search | tst.js:491:7:491:39 | target | provenance |  |
 | tst.js:492:18:492:23 | target | tst.js:492:18:492:54 | target. ... "), '') | provenance |  |
+| tst.js:498:7:498:26 | source | tst.js:499:27:499:32 | source | provenance |  |
+| tst.js:498:16:498:26 | window.name | tst.js:498:7:498:26 | source | provenance |  |
+| tst.js:499:27:499:32 | source | tst.js:499:18:499:33 | unescape(source) | provenance |  |
 | typeahead.js:9:28:9:30 | loc | typeahead.js:10:16:10:18 | loc | provenance |  |
 | typeahead.js:20:13:20:45 | target | typeahead.js:21:12:21:17 | target | provenance |  |
 | typeahead.js:20:22:20:45 | documen ... .search | typeahead.js:20:13:20:45 | target | provenance |  |
diff --git a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/tst.js b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/tst.js
index a92e6e954909..0ecc2535272d 100644
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/tst.js
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/tst.js
@@ -493,3 +493,8 @@ function nonGlobalSanitizer() {
   $("#foo").html(target.replace(new RegExp("<|>", unknownFlags()), '')); // OK - most likely good. We don't know what the flags are.
   $("#foo").html(target.replace(new RegExp("<|>", "g"), ''));
 }
+
+function FooBar() {
+  let source = window.name; // $ Source
+  $('myId').html(unescape(source)) // $ Alert
+}