CVE-2026-8787

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

The Firebase Support & Chat Management plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 3.1.1. This is due to the firebase_auth() function authenticating the request as the WordPress user whose email is supplied in the user_email POST parameter without verifying ownership of that email (no Firebase ID token signature/issuer/audience verification). This makes it possible for authenticated attackers, with Subscriber-level access and above, to log in as an arbitrary existing user — including an Administrator — by submitting that user's email address to the acb_firebase_auth AJAX action, resulting in full account takeover.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 27, 2026

References (5)

Vendor Advisories for CVE-2026-8787(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 8× in last 7d / 36× 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 216 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8787?
CVE-2026-8787 is a high vulnerability published on May 27, 2026. The Firebase Support & Chat Management plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 3.1.1. This is due to the firebaseauth() function authenticating the request as the WordPress user whose email is supplied in the useremail POST parameter without…
When was CVE-2026-8787 disclosed?
CVE-2026-8787 was first published in the National Vulnerability Database on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8787 actively exploited?
CVE-2026-8787 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.2% of all scored CVEs.
What is the CVSS score of CVE-2026-8787?
CVE-2026-8787 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-8787?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8787, 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.

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