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GHSA-j3v9-553h-x28j

HighCVSS 7.2 / 10

Published May 11, 2026·Last modified May 11, 2026

Affected Components(0)

No affected components available

Description

Any authenticated user can inject arbitrary HTML via updating their account's font family.

Impact

Cross-site scripting. The injected payload will be reflected in every MantisBT page.

Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover.

Patches

9e8409cdd979eba86ef532756fc47c1d8112d22d

Workarounds

None

Credits

Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.

Risk Scores

Base Score

7.2

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges.

Threat Intelligence

4.2

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

0.42%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity

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