CVE-2026-71555

MEDIUMPre-NVD 4.14.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (19th 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
4.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target="_blank") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.

CVSS v3
4.1
EG Score
4.1MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100CISA 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
Severity41% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 6, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Aug 6, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

Reverse tabnabbing in room description · Advisory · THM-Health/PILOS · GitHub

https://github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5
github_release Patch Available

PILOS 4.14.1

Patch available: THM-Health/PILOS v4.14.1

https://github.com/THM-Health/PILOS/releases/tag/v4.14.1
github_commit Patch Available

commit b50f2bd07c4f (THM-Health/PILOS)

Patch available: THM-Health/PILOS v4.14.1 (contains commit b50f2bd07c4f)

https://github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae3579275d81

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 43× 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.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 23:21 UTCEG score recompute
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-05 08:20 UTCEG score recompute
  8. 2026-10-04 23:22 UTCEPSS rescore
  9. 2026-10-04 05:46 UTCEG score recompute
  10. 2026-10-03 14:26 UTCEPSS rescore
  11. 2026-10-02 09:36 UTCEG score recompute
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-09-30 22:58 UTCEG score recompute
  14. 2026-09-30 15:03 UTCEPSS rescore
  15. 2026-09-29 05:51 UTCEG score recompute
  16. 2026-09-28 13:52 UTCEPSS rescore
  17. 2026-09-27 17:13 UTCEG score recompute
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-25 04:50 UTCEG score recompute
  21. 2026-09-24 03:30 UTCEG score recompute
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-23 02:11 UTCEG score recompute
  24. 2026-09-22 00:51 UTCEG score recompute
  25. 2026-09-21 21:09 UTCEPSS rescore
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  1. 2026-09-20 20:34 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-19 12:59 UTCEG score recompute
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 08:30 UTCEG score recompute
  6. 2026-09-17 07:09 UTCEG score recompute
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 05:49 UTCEG score recompute
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 04:30 UTCEG score recompute
  11. 2026-09-15 03:12 UTCEPSS rescore
  12. 2026-09-14 02:45 UTCEG score recompute
  13. 2026-09-13 01:24 UTCEG score recompute
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-12 00:04 UTCEG score recompute
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-10 20:59 UTCEG score recompute
  18. 2026-09-10 09:35 UTCEPSS rescore
  19. 2026-09-09 06:03 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-07 17:49 UTCEG score recompute
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 11:50 UTCEG score recompute
  24. 2026-09-05 10:31 UTCEG score recompute
  25. 2026-09-04 09:08 UTCEG score recompute
  26. 2026-09-04 05:07 UTCEPSS rescore
  27. 2026-09-03 06:09 UTCEG score recompute
  28. 2026-09-02 14:12 UTCEPSS rescore
  29. 2026-09-01 23:51 UTCEG score recompute
  30. 2026-09-01 13:54 UTCEPSS rescore
  31. 2026-09-01 04:40 UTCEPSS rescore
  32. 2026-08-31 22:31 UTCEG score recompute
  33. 2026-08-30 19:17 UTCEPSS rescore
  34. 2026-08-29 10:27 UTCEG score recompute
  35. 2026-08-28 21:42 UTCEPSS rescore
  36. 2026-08-27 20:41 UTCEG score recompute
  37. 2026-08-26 18:59 UTCEG score recompute
  38. 2026-08-26 14:47 UTCEPSS rescore
  39. 2026-08-25 17:18 UTCEG score recompute
  40. 2026-08-25 13:49 UTCEPSS rescore
  41. 2026-08-24 15:51 UTCEG score recompute
  42. 2026-08-22 13:12 UTCEG score recompute
  43. 2026-08-21 23:49 UTCEPSS rescore
  44. 2026-08-21 11:52 UTCEG score recompute
  45. 2026-08-20 22:56 UTCEPSS rescore
  46. 2026-08-20 10:32 UTCEG score recompute
  47. 2026-08-19 17:04 UTCEPSS rescore
  48. 2026-08-19 09:13 UTCEG score recompute
  49. 2026-08-18 13:49 UTCEPSS rescore
  50. 2026-08-18 13:49 UTCEPSS rescore
  51. 2026-08-18 07:53 UTCEG score recompute
  52. 2026-08-17 13:47 UTCEPSS rescore
  53. 2026-08-17 06:33 UTCEG score recompute
  54. 2026-08-16 14:56 UTCEPSS rescore
  55. 2026-08-16 14:56 UTCEPSS rescore
  56. 2026-08-16 05:03 UTCEG score recompute
  57. 2026-08-16 02:15 UTCEPSS rescore
  58. 2026-08-15 03:44 UTCEG score recompute
  59. 2026-08-15 01:31 UTCEPSS rescore
  60. 2026-08-14 02:24 UTCEG score recompute
  61. 2026-08-13 22:00 UTCEPSS rescore
  62. 2026-08-13 01:05 UTCEG score recompute
  63. 2026-08-12 13:51 UTCEPSS rescore
  64. 2026-08-11 23:45 UTCEG score recompute
  65. 2026-08-11 00:00 UTCEPSS rescore
  66. 2026-08-09 21:06 UTCEG score recompute
  67. 2026-08-09 13:47 UTCEPSS rescore
  68. 2026-08-08 19:47 UTCEG score recompute
  69. 2026-08-08 16:37 UTCEPSS rescore
  70. 2026-08-07 18:27 UTCEG score recompute
  71. 2026-08-07 17:27 UTCEG score recompute
  72. 2026-08-06 22:37 UTCEG score recompute
  73. 2026-08-06 22:15 UTCEG score recompute
  74. 2026-08-06 22:15 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-71555?
CVE-2026-71555 is a medium vulnerability published on August 6, 2026. PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target="_blank") retain a window.opener…
When was CVE-2026-71555 disclosed?
CVE-2026-71555 was first published on August 6, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71555 actively exploited?
CVE-2026-71555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71555?
CVE-2026-71555 has a CVSS base score of 4.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71555?
A fix for CVE-2026-71555 is available: update to the fixed version the vendor names in its advisory.

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