CVE-2026-21571

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 22% 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
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.4Exploit: NoneExposed: 0

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

This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0, 11.0.0, 11.1.0, 12.0.0, and 12.1.0 of Bamboo Data Center.   This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.4 and a CVSS Vector of CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H allows an authenticated attacker to execute commands on the remote system, which has high impact to confidentiality, high impact to integrity, high impact to availability, and requires no user interaction.   Atlassian recommends that Bamboo 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: Bamboo Data Center 9.6.0: Upgrade to a release greater than or equal to 9.6.25 Bamboo Data Center 10.2: Upgrade to a release greater than or equal to 10.2.18  Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.6 See the release notes ([https://confluence.atlassian.com/bambooreleases/bamboo-release-notes-1189793869.html]). You can download the latest version of Bamboo Data Center from the download center ([https://www.atlassian.com/software/bamboo/download-archives]).

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
66.5%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated May 1, 2026
No patch confirmed yet.
generic

Loading...

https://jira.atlassian.com/browse/BAM-26364
generic

Security Bulletin - April 21 2026 | Atlassian Support | Atlassian Documentation

https://confluence.atlassian.com/pages/viewpage.action?pageId=1770913890

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 40× 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 188 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 02:00 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-13 22:30 UTCEPSS rescore
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 08:27 UTCEPSS rescore
  9. 2026-07-09 19:10 UTCEPSS rescore
  10. 2026-07-08 15:15 UTCEPSS rescore
  11. 2026-07-08 15:15 UTCEPSS rescore
  12. 2026-07-07 13:46 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-05 02:30 UTCEPSS rescore
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-01 15:06 UTCEPSS rescore
  21. 2026-07-01 15:06 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 75 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-27 03:08 UTCEPSS rescore
  3. 2026-06-25 13:49 UTCEPSS rescore
  4. 2026-06-24 14:05 UTCEPSS rescore
  5. 2026-06-23 21:32 UTCEPSS rescore
  6. 2026-06-22 14:25 UTCEPSS rescore
  7. 2026-06-22 14:25 UTCEPSS rescore
  8. 2026-06-21 14:56 UTCEPSS rescore
  9. 2026-06-21 14:56 UTCEPSS rescore
  10. 2026-06-21 01:59 UTCEPSS rescore
  11. 2026-06-21 01:59 UTCEPSS rescore
  12. 2026-06-19 19:25 UTCEPSS rescore
  13. 2026-06-18 17:52 UTCEPSS rescore
  14. 2026-06-17 17:53 UTCEPSS rescore
  15. 2026-06-16 17:52 UTCEPSS rescore
  16. 2026-06-15 17:48 UTCEPSS rescore
  17. 2026-06-15 03:02 UTCEG score recompute
  18. 2026-06-15 03:02 UTCGHSA enrichment
  19. 2026-06-14 23:18 UTCEPSS rescore
  20. 2026-06-14 22:49 UTCEG score recompute
  21. 2026-06-14 22:48 UTCGHSA enrichment
  22. 2026-06-14 18:40 UTCEG score recompute
  23. 2026-06-14 18:40 UTCGHSA enrichment
  24. 2026-06-13 23:00 UTCEPSS rescore
  25. 2026-06-13 23:00 UTCEPSS rescore
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 05:37 UTCEG score recompute
  28. 2026-06-12 05:37 UTCGHSA enrichment
  29. 2026-06-12 01:40 UTCEG score recompute
  30. 2026-06-12 01:40 UTCGHSA enrichment
  31. 2026-06-11 21:43 UTCEG score recompute
  32. 2026-06-11 21:43 UTCGHSA enrichment
  33. 2026-06-11 17:46 UTCEG score recompute
  34. 2026-06-11 17:46 UTCGHSA enrichment
  35. 2026-06-11 14:00 UTCEPSS rescore
  36. 2026-06-10 22:18 UTCEPSS rescore
  37. 2026-06-10 20:09 UTCEG score recompute
  38. 2026-06-10 20:09 UTCGHSA enrichment
  39. 2026-06-10 16:12 UTCEG score recompute
  40. 2026-06-10 16:12 UTCGHSA enrichment
  41. 2026-06-10 13:22 UTCEPSS rescore
  42. 2026-06-10 12:15 UTCEG score recompute
  43. 2026-06-10 12:15 UTCGHSA enrichment
  44. 2026-06-10 08:17 UTCEG score recompute
  45. 2026-06-10 08:17 UTCGHSA enrichment
  46. 2026-06-10 04:07 UTCEG score recompute
  47. 2026-06-10 04:07 UTCGHSA enrichment
  48. 2026-06-10 00:10 UTCEG score recompute
  49. 2026-06-10 00:10 UTCGHSA enrichment
  50. 2026-06-09 17:45 UTCEG score recompute
  51. 2026-06-09 17:45 UTCGHSA enrichment
  52. 2026-06-09 13:48 UTCEG score recompute
  53. 2026-06-09 13:48 UTCGHSA enrichment
  54. 2026-06-09 09:51 UTCEG score recompute
  55. 2026-06-09 09:51 UTCGHSA enrichment
  56. 2026-06-09 04:28 UTCEG score recompute
  57. 2026-06-09 04:28 UTCGHSA enrichment
  58. 2026-06-08 14:17 UTCEPSS rescore
  59. 2026-06-08 14:17 UTCEPSS rescore
  60. 2026-06-08 13:57 UTCEG score recompute
  61. 2026-06-08 13:57 UTCGHSA enrichment
  62. 2026-06-08 10:00 UTCEG score recompute
  63. 2026-06-08 10:00 UTCGHSA enrichment
  64. 2026-06-08 06:03 UTCEG score recompute
  65. 2026-06-08 06:03 UTCGHSA enrichment
  66. 2026-06-08 02:05 UTCEG score recompute
  67. 2026-06-08 02:05 UTCGHSA enrichment
  68. 2026-06-07 22:08 UTCEG score recompute
  69. 2026-06-07 22:08 UTCGHSA enrichment
  70. 2026-06-07 18:10 UTCEG score recompute
  71. 2026-06-07 18:10 UTCGHSA enrichment
  72. 2026-06-07 15:25 UTCEPSS rescore
  73. 2026-06-07 15:24 UTCEPSS rescore
  74. 2026-06-07 14:13 UTCEG score recompute
  75. 2026-06-07 14:13 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21571?
CVE-2026-21571 is a critical vulnerability published on April 21, 2026. This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0, 11.0.0, 11.1.0, 12.0.0, and 12.1.0 of Bamboo Data Center. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.4 and a CVSS Vector of…
When was CVE-2026-21571 disclosed?
CVE-2026-21571 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21571 actively exploited?
CVE-2026-21571 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 66.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-21571?
CVE-2026-21571 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-21571?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21571, 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

Explore the affected products and dependency analysis for CVE-2026-21571

Explore →

Is Your Infrastructure Affected by CVE-2026-21571?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs