CVE-2026-21582

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (37th percentile of EPSS-scored CVEs). 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, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

This High severity BASM (Broken Authentication & Session Management) vulnerability known as CVE-2026-21582 was introduced in version 7.2.1 of Crowd Data Center. This BASM (Broken Authentication & Session Management) vulnerability, with a CVSS Score of 8.8, allows an unauthenticated attacker to perform actions as another user. Atlassian recommends that Crowd Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: Crowd Data Center 7.2: Upgrade to a release greater than or equal to 7.2.2 See the release notes (https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html). You can download the latest version of Crowd Data Center from the download center (https://www.atlassian.com/software/crowd/download-archive). This vulnerability was reported via our Penetration Testing program.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 45%
Exploitation0% × 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
0.5%
EPSS %ILE
37th
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 18, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
No patch confirmed yet.
generic

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https://jira.atlassian.com/browse/CWD-6562
generic

Security Bulletin - August 18 2026 | Atlassian Support | Atlassian Documentation

https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999768

Vendor Advisories for CVE-2026-21582(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 / 102× 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 174 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-21582?
CVE-2026-21582 is a high vulnerability published on August 18, 2026. This High severity BASM (Broken Authentication & Session Management) vulnerability known as CVE-2026-21582 was introduced in version 7.2.1 of Crowd Data Center. This BASM (Broken Authentication & Session Management) vulnerability, with a CVSS Score of 8.8, allows an unauthenticated attacker to…
When was CVE-2026-21582 disclosed?
CVE-2026-21582 was first published on August 18, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21582 actively exploited?
CVE-2026-21582 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-21582?
CVE-2026-21582 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-21582?
No fix for CVE-2026-21582 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-2026-21582 are linked in the Vendor Advisories panel on this page.

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