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CVE-2025-40902

HTML injection in Users in Guardian/CMC before 26.1.0

Description

A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML tags. When a victim attempts to delete a group containing the affected user, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

Timeline

  1. ID reserved

    By Nozomi

  2. · 13 months later

    Published

  3. · 3 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-40902, by who scored it
Scored byCVSSScoreVector
NozomiCNA (assigner)4.0Medium4.8CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
NozomiCNA (assigner)3.1Medium5.9CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
NVDNVD · Modified4.0Medium4.8CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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
EPSS (exploitation in 30 days)
0.19% · top 91% of all CVEs (11 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.

Affected products

What to do

Solution: Upgrade to v26.1.0 or later.

Workaround: Use internal firewall features to limit access to the web management interface.

Workaround: Review all accounts with administrative access to it and delete unnecessary ones.

Workaround: Review usernames of existing users.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .