CVE-2025-40902

MEDIUMNVD 4.85.9▲
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2026-05-19. NVD baseline CVSS 4.8; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
4.8
EG Score
5.9(medium)
EPSS
9.3%
KEV
Not listed

Published

May 19, 2026

Last Modified

June 9, 2026

Advisory Details (2)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

SSA-827968

https://cert-portal.siemens.com/productcert/html/ssa-827968.html
generic

NN-2026:5-01 - HTML injection in Users in Guardian/CMC before 26.1.0 - CVE-2025-40902 | Product Security Incident Response Portal

https://security.nozominetworks.com/NN-2026:5-01

Vendor Advisories for CVE-2025-40902(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 61× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 146 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 01:59 UTCEPSS rescore
  4. 2026-07-15 01:59 UTCEPSS rescore
  5. 2026-07-13 22:29 UTCEPSS rescore
  6. 2026-07-13 22:29 UTCEPSS rescore
  7. 2026-07-13 06:12 UTCEPSS rescore
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-09 19:09 UTCEPSS rescore
  12. 2026-07-09 19:09 UTCEPSS rescore
  13. 2026-07-07 13:45 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 16:27 UTCEPSS rescore
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-05 02:30 UTCEPSS rescore
  18. 2026-07-04 06:30 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-07-01 15:06 UTCEPSS rescore
  21. 2026-06-30 23:22 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-29 20:58 UTCEG score recompute
  24. 2026-06-29 20:58 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 75 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-28 14:07 UTCEPSS rescore
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:55 UTCEPSS rescore
  5. 2026-06-28 04:55 UTCEPSS rescore
  6. 2026-06-27 20:31 UTCEG score recompute
  7. 2026-06-27 20:31 UTCGHSA enrichment
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-26 19:50 UTCEG score recompute
  11. 2026-06-26 19:50 UTCGHSA enrichment
  12. 2026-06-25 17:15 UTCEG score recompute
  13. 2026-06-25 17:15 UTCGHSA enrichment
  14. 2026-06-25 13:49 UTCEPSS rescore
  15. 2026-06-25 13:49 UTCEPSS rescore
  16. 2026-06-24 14:04 UTCEPSS rescore
  17. 2026-06-24 14:04 UTCEPSS rescore
  18. 2026-06-23 21:32 UTCEPSS rescore
  19. 2026-06-23 21:32 UTCEPSS rescore
  20. 2026-06-22 14:25 UTCEPSS rescore
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-21 14:56 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 01:59 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
  26. 2026-06-19 19:25 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
  28. 2026-06-18 17:52 UTCEPSS rescore
  29. 2026-06-18 17:52 UTCEPSS rescore
  30. 2026-06-17 21:47 UTCEG score recompute
  31. 2026-06-17 21:47 UTCGHSA enrichment
  32. 2026-06-17 17:52 UTCEPSS rescore
  33. 2026-06-16 22:26 UTCEG score recompute
  34. 2026-06-16 22:26 UTCGHSA enrichment
  35. 2026-06-16 17:52 UTCEPSS rescore
  36. 2026-06-16 17:52 UTCEPSS rescore
  37. 2026-06-15 23:04 UTCEG score recompute
  38. 2026-06-15 23:04 UTCGHSA enrichment
  39. 2026-06-14 23:17 UTCEPSS rescore
  40. 2026-06-14 22:08 UTCEG score recompute
  41. 2026-06-14 22:08 UTCGHSA enrichment
  42. 2026-06-13 23:00 UTCEPSS rescore
  43. 2026-06-13 22:45 UTCEG score recompute
  44. 2026-06-13 22:45 UTCGHSA enrichment
  45. 2026-06-12 23:11 UTCEPSS rescore
  46. 2026-06-12 21:22 UTCEG score recompute
  47. 2026-06-12 21:22 UTCGHSA enrichment
  48. 2026-06-11 22:01 UTCEG score recompute
  49. 2026-06-11 22:01 UTCGHSA enrichment
  50. 2026-06-11 14:00 UTCEPSS rescore
  51. 2026-06-10 22:39 UTCEG score recompute
  52. 2026-06-10 22:39 UTCGHSA enrichment
  53. 2026-06-10 22:18 UTCEPSS rescore
  54. 2026-06-10 13:22 UTCEPSS rescore
  55. 2026-06-09 23:18 UTCEG score recompute
  56. 2026-06-09 23:18 UTCGHSA enrichment
  57. 2026-06-09 10:41 UTCNVD updateCVSS v3 → 4.8
  58. 2026-06-08 23:57 UTCEG score recompute
  59. 2026-06-08 23:57 UTCGHSA enrichment
  60. 2026-06-08 14:16 UTCEPSS rescore
  61. 2026-06-08 14:16 UTCEPSS rescore
  62. 2026-06-08 00:36 UTCEG score recompute
  63. 2026-06-08 00:36 UTCGHSA enrichment
  64. 2026-06-07 15:24 UTCEPSS rescore
  65. 2026-06-07 01:15 UTCEG score recompute
  66. 2026-06-07 01:15 UTCGHSA enrichment
  67. 2026-06-06 13:47 UTCEPSS rescore
  68. 2026-06-06 13:47 UTCEPSS rescore
  69. 2026-06-06 01:53 UTCEG score recompute
  70. 2026-06-06 01:53 UTCGHSA enrichment
  71. 2026-06-05 22:46 UTCEPSS rescore
  72. 2026-06-05 22:46 UTCEPSS rescore
  73. 2026-06-05 06:10 UTCEPSS rescore
  74. 2026-06-05 06:10 UTCEPSS rescore
  75. 2026-06-05 02:32 UTCEG score recompute

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Frequently asked(5)

What is CVE-2025-40902?
CVE-2025-40902 is a medium vulnerability published on May 19, 2026. 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…
When was CVE-2025-40902 disclosed?
CVE-2025-40902 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-40902 actively exploited?
CVE-2025-40902 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-40902?
CVE-2025-40902 has a CVSS v3 base score of 4.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.9.
How do I remediate CVE-2025-40902?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40902, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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