Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-73vx-49mv-v8w5
Advisory ID github_osv/GHSA-73vx-49mv-v8w5
Aliases CVE-2026-33548
Summary MantisBT has Stored HTML Injection/XSS when displaying Tags in Timeline Improper escaping of tag names retrieved from History in Timeline (my_view_page.php) allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript, when displaying a tag that has been renamed or deleted. ### Impact Cross-site scripting (XSS). ### Patches f32787c14d4518476fe7f05f992dbfe6eaccd815 ### Workarounds * Edit offending History entries (using SQL) * Wrap `$this->tag_name` in a string_html_specialchars() call in IssueTagTimelineEvent::html() ### Credits MantisBT thanks Vishal Shukla for discovering and responsibly reporting the issue.
Status Published
Exploitability 0.5
Weighted Severity 7.7
Risk 3.9
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
cvssv3.1 6.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-73vx-49mv-v8w5/GHSA-73vx-49mv-v8w5.json
cvssv4 8.6 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-73vx-49mv-v8w5/GHSA-73vx-49mv-v8w5.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/mantisbt/mantisbt
https://mantisbt.org/bugs/view.php?id=36973
CVE-2026-33548 https://nvd.nist.gov/vuln/detail/CVE-2026-33548
f32787c14d4518476fe7f05f992dbfe6eaccd815 Other https://github.com/mantisbt/mantisbt/commit/f32787c14d4518476fe7f05f992dbfe6eaccd815
GHSA-73vx-49mv-v8w5 Other https://github.com/mantisbt/mantisbt/security/advisories/GHSA-73vx-49mv-v8w5
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-73vx-49mv-v8w5/GHSA-73vx-49mv-v8w5.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-73vx-49mv-v8w5/GHSA-73vx-49mv-v8w5.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-03-24T16:05:45Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33548.json

Source Advisory: vulnrichment/CVE-2026-33548

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]