CVE-2026-7637

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-20. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

The Boost plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.0.3 via deserialization of untrusted input in the STYXKEY-BOOST_USER_LOCATION cookie. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
43.5%
KEV
Not listed

Published

May 20, 2026

Last Modified

May 20, 2026

Advisory Details (1)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

Boost your conversion with social proof - The Boost Plugin

https://www.pixelyoursite.com/boost-plugin

Vendor Advisories for CVE-2026-7637(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 / 84× 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 298 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7637?
CVE-2026-7637 is a critical vulnerability published on May 20, 2026. The Boost plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.0.3 via deserialization of untrusted input in the STYXKEY-BOOSTUSERLOCATION cookie. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in…
When was CVE-2026-7637 disclosed?
CVE-2026-7637 was first published in the National Vulnerability Database on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7637 actively exploited?
CVE-2026-7637 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7637?
CVE-2026-7637 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-7637?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7637, 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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