Every CVE Search/ Get API key

CVE-2026-33517

MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation

8.6 HighFix available

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder %1$s from $s_tag_delete_message string.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.25%Up 0.2 points since Mar 24, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.6

MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder %1$s from $s_tag_delete_message string.

Record
CVE-2026-33517
CVSS 4.0
8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-14523 8.6

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder %1$s from $s_tag_delete_message string.

Record
EUVD-2026-14523
CVSS 4.0
8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-fh48-f69w-7vmp 8.6

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 $s_tag_delete_message string, for example with sed -r -i '/tag_delete_message/s/.%1\$s.//' -- lang/

Credits

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

Record
GHSA-fh48-f69w-7vmp
CVSS 4.0
8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
NVD 8.6

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder %1$s from $s_tag_delete_message string.

Record
CVE-2026-33517
CVSS 4.0
8.6 HighCVSS: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
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 8.6

MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder %1$s from $s_tag_delete_message string.

Record
CVE-2026-33517
CVSS 4.0
8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVGHSA-fh48-f69w-7vmp 8.6

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 $s_tag_delete_message string, for example with sed -r -i '/tag_delete_message/s/.%1\$s.//' -- lang/

Credits

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

Record
GHSA-fh48-f69w-7vmp
CVSS 4.0
8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mantisbt/mantisbt
Packagist
 2.28.0 to 2.28.0
2.28.1
mantisbt/mantisbt
Packagist
 2.28.0 up to 2.28.1
2.28.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-33517 is a high vulnerability (CVSS 8.6) in Mantisbt, published March 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. Fixed in mantisbt/mantisbt 2.28.1.

References

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open