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CVE

CVE-2026-33517

MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation
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CVE

CVE-2026-33517

MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation

Improper escaping of Tag name when deleting it in tag_delete.php allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript.

Impact

Cross-site scripting (XSS).

Patches

80990f43153167c73f11eb4b2bc7108d0c3d6b46

Workarounds

  • Revert commit d6890320752ecf37bd74d11fe14fe7dc12335be9
  • Manually edit language files to remove the sprintf placeholder %1$s from $stagdelete_message  string, for example with sed -r -i '/tagdeletemessage/s/.%1\$s.//' -- lang/

Credits

MantisBT hanks Vishal Shukla for discovering and responsibly reporting the issue.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.6
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fh48-f69w-7vmp, https://nvd.nist.gov/vuln/detail/CVE-2026-33517, https://github.com/mantisbt/mantisbt/commit/80990f43153167c73f11eb4b2bc7108d0c3d6b46, https://github.com/mantisbt/mantisbt/commit/d6890320752ecf37bd74d11fe14fe7dc12335be9, https://github.com/mantisbt/mantisbt, https://mantisbt.org/bugs/view.php?id=36971

Severity

6.1

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
6.1
EPSS Probability
0.00049%
EPSS Percentile
0.15736%
Introduced Version
2.28.0
Fix Available
2.28.1

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