CVE-2026-33548
MantisBT 2.28.0 tag HTML injection may execute JS.
Is CVE-2026-33548 being exploited?
Not confirmed. CVE-2026-33548 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.20% probability of exploitation in the next 30 days.
How severe is CVE-2026-33548?
CVE-2026-33548 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33548?
Yes. A fix has been recorded for CVE-2026-33548. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33548 affect?
CVE-2026-33548 affects MantisBT 2.28.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33548?
Upgrade to 2.28.1 or patch; sanitize tag_name.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE via HTML injection of History Timeline tag names; may run JS in user browsers if CSP allows.
Patch when possible
- affected= 2.28.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.