CVE-2026-66256

HIGHPre-NVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.2EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 7.2Exploit: None knownExposed services: Not assessed

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

UNSUPPORTED WHEN ASSIGNED Deserialization of Untrusted Data vulnerability in Apache Shindig.

This issue affects Apache Shindig: all versions.

Users with access to the Shindig REST API can send specially-crafted requests to trigger arbitrary code execution on the server.

As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users.

NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

CVSS v3
7.2
EG Score
7.2HIGHmedium confidence
EG Risk
33
EG Risk 33/100CISA SSVC

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
Severity72% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.9%
EPSS %ILE
59th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

September 11, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic
https://lists.apache.org/thread/opgpnhk149614gx6vcy3lvyjnycw8mkh

Vendor Advisories for CVE-2026-66256(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 21× in last 7d / 97× 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 190 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-66256?
CVE-2026-66256 is a high vulnerability published on August 13, 2026. UNSUPPORTED WHEN ASSIGNED Deserialization of Untrusted Data vulnerability in Apache Shindig. This issue affects Apache Shindig: all versions. Users with access to the Shindig REST API can send specially-crafted requests to trigger arbitrary code execution on the server. As this project is retired,…
When was CVE-2026-66256 disclosed?
CVE-2026-66256 was first published on August 13, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66256 actively exploited?
CVE-2026-66256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (59th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66256?
CVE-2026-66256 has a CVSS v3.1 base score of 7.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-66256?
No fix for CVE-2026-66256 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-66256 are linked in the Vendor Advisories panel on this page.

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