CVE-2026-8931

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
9.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.4Exploit: None knownExposed: 0

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

A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3.

CVSS v3
9.4
EG Score
9.4(medium)
EG Risk
58(Track)
EG Risk 58/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity94% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 22, 2026

Advisory Details (6)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Dôležitá aktualizácia aplikácie Web Signer | DISIG

https://www.disig.sk/sk/aktuality/dolezita-aktualizacia-aplikacie-web-signer/
generic

Important update of the Web Signer application | DISIG

https://www.disig.sk/en/news/important-update-of-the-web-signer-application/
generic

QES Portál - Elektronický podpis bez hraníc

https://qesportal.sk/Portal/sk/Info/News#websigner255
generic

QES Portal - Electronic signature without borders

https://qesportal.sk/Portal/en/Info/News#websigner255
generic
https://download.disigcdn.sk/cdn/products/websigner2/changelog.sk.txt
generic
https://download.disigcdn.sk/cdn/products/websigner2/changelog.en.txt

Vendor Advisories for CVE-2026-8931(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 8× in last 7d / 47× 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 380 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8931?
CVE-2026-8931 is a critical vulnerability published on June 1, 2026. A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3.
When was CVE-2026-8931 disclosed?
CVE-2026-8931 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8931 actively exploited?
CVE-2026-8931 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.0% of all scored CVEs.
What is the CVSS score of CVE-2026-8931?
CVE-2026-8931 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-8931?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8931, 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.

Dependency Blast Radius

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