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 50% 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
50%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 22, 2026

Advisory Details (6)

Auto-updated Jul 31, 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 22× in last 7d / 62× 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 231 total refreshes for this CVE.

  1. 2026-08-01 21:55 UTCGHSA enrichment
  2. 2026-08-01 17:47 UTCGHSA enrichment
  3. 2026-08-01 13:40 UTCEG score recompute
  4. 2026-08-01 13:40 UTCGHSA enrichment
  5. 2026-08-01 04:16 UTCEPSS rescore
  6. 2026-07-31 15:23 UTCGHSA enrichment
  7. 2026-07-31 10:14 UTCGHSA enrichment
  8. 2026-07-31 05:44 UTCEG score recompute
  9. 2026-07-31 05:44 UTCGHSA enrichment
  10. 2026-07-30 16:28 UTCEPSS rescore
  11. 2026-07-30 01:30 UTCEPSS rescore
  12. 2026-07-29 15:39 UTCGHSA enrichment
  13. 2026-07-29 11:14 UTCEG score recompute
  14. 2026-07-29 11:14 UTCGHSA enrichment
  15. 2026-07-28 15:37 UTCEPSS rescore
  16. 2026-07-28 03:53 UTCEG score recompute
  17. 2026-07-28 03:53 UTCGHSA enrichment
  18. 2026-07-27 14:14 UTCEPSS rescore
  19. 2026-07-27 09:01 UTCGHSA enrichment
  20. 2026-07-26 23:41 UTCEG score recompute
  21. 2026-07-26 23:41 UTCGHSA enrichment
  22. 2026-07-26 14:54 UTCEPSS rescore
  23. 2026-07-25 14:18 UTCEPSS rescore
  24. 2026-07-24 14:18 UTCEPSS rescore
  25. 2026-07-23 14:18 UTCEPSS rescore
Show 75 more
  1. 2026-07-23 03:23 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-16 17:03 UTCEPSS rescore
  10. 2026-07-16 09:58 UTCGHSA enrichment
  11. 2026-07-16 01:34 UTCGHSA enrichment
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 02:00 UTCEPSS rescore
  14. 2026-07-14 21:52 UTCGHSA enrichment
  15. 2026-07-14 17:28 UTCGHSA enrichment
  16. 2026-07-14 13:11 UTCGHSA enrichment
  17. 2026-07-14 05:48 UTCGHSA enrichment
  18. 2026-07-13 22:31 UTCEPSS rescore
  19. 2026-07-13 06:13 UTCEPSS rescore
  20. 2026-07-12 05:46 UTCEPSS rescore
  21. 2026-07-12 02:47 UTCGHSA enrichment
  22. 2026-07-11 22:24 UTCGHSA enrichment
  23. 2026-07-11 17:56 UTCGHSA enrichment
  24. 2026-07-11 13:38 UTCGHSA enrichment
  25. 2026-07-11 08:27 UTCEPSS rescore
  26. 2026-07-09 19:10 UTCEPSS rescore
  27. 2026-07-08 22:37 UTCGHSA enrichment
  28. 2026-07-08 16:59 UTCGHSA enrichment
  29. 2026-07-08 15:16 UTCEPSS rescore
  30. 2026-07-07 13:46 UTCEPSS rescore
  31. 2026-07-06 16:27 UTCEPSS rescore
  32. 2026-07-06 02:23 UTCEPSS rescore
  33. 2026-07-06 02:23 UTCEPSS rescore
  34. 2026-07-05 02:31 UTCEPSS rescore
  35. 2026-07-05 02:30 UTCEPSS rescore
  36. 2026-07-04 06:31 UTCEPSS rescore
  37. 2026-07-04 06:31 UTCEPSS rescore
  38. 2026-07-02 23:00 UTCGHSA enrichment
  39. 2026-07-02 18:35 UTCGHSA enrichment
  40. 2026-07-02 12:47 UTCGHSA enrichment
  41. 2026-07-02 07:54 UTCGHSA enrichment
  42. 2026-07-02 02:19 UTCGHSA enrichment
  43. 2026-07-01 21:08 UTCGHSA enrichment
  44. 2026-07-01 16:43 UTCGHSA enrichment
  45. 2026-07-01 15:07 UTCEPSS rescore
  46. 2026-07-01 12:27 UTCGHSA enrichment
  47. 2026-07-01 08:19 UTCGHSA enrichment
  48. 2026-07-01 00:31 UTCGHSA enrichment
  49. 2026-06-30 23:22 UTCEPSS rescore
  50. 2026-06-30 05:27 UTCGHSA enrichment
  51. 2026-06-30 00:35 UTCGHSA enrichment
  52. 2026-06-29 20:07 UTCGHSA enrichment
  53. 2026-06-29 15:59 UTCGHSA enrichment
  54. 2026-06-29 14:06 UTCEPSS rescore
  55. 2026-06-29 11:50 UTCGHSA enrichment
  56. 2026-06-29 03:28 UTCGHSA enrichment
  57. 2026-06-28 23:13 UTCGHSA enrichment
  58. 2026-06-28 19:03 UTCGHSA enrichment
  59. 2026-06-28 14:55 UTCGHSA enrichment
  60. 2026-06-28 14:07 UTCEPSS rescore
  61. 2026-06-28 10:43 UTCGHSA enrichment
  62. 2026-06-28 06:33 UTCGHSA enrichment
  63. 2026-06-28 04:56 UTCEPSS rescore
  64. 2026-06-28 02:15 UTCGHSA enrichment
  65. 2026-06-27 22:05 UTCGHSA enrichment
  66. 2026-06-27 17:52 UTCGHSA enrichment
  67. 2026-06-27 13:44 UTCGHSA enrichment
  68. 2026-06-27 09:36 UTCGHSA enrichment
  69. 2026-06-27 05:28 UTCGHSA enrichment
  70. 2026-06-27 03:08 UTCEPSS rescore
  71. 2026-06-27 01:20 UTCGHSA enrichment
  72. 2026-06-26 20:06 UTCGHSA enrichment
  73. 2026-06-26 15:58 UTCGHSA enrichment
  74. 2026-06-26 03:51 UTCGHSA enrichment
  75. 2026-06-25 23:43 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 49.7% 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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