CVE-2026-50635

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.

CVSS v3
8.8
EG Score
8.8(high)
EPSS
29.2%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 23, 2026

Advisory Details (3)

Auto-updated Jun 9, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

LimeSurvey Password Reset Host Header Injection Discloses Reset Token | Advisories | VulnCheck

https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token
generic

LimeSurvey — Free Online Survey Tool

https://www.limesurvey.org/
github_pr

Fixed issue #20548: [security] Host Header Injection in Password Reset

Fix merged in LimeSurvey/LimeSurvey PR #5032 on 2026-06-09 — awaiting tagged release

https://github.com/LimeSurvey/LimeSurvey/pull/5032

Vendor Advisories for CVE-2026-50635(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 30× in last 7d / 147× 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 147 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-50635?
CVE-2026-50635 is a high vulnerability published on June 9, 2026. LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no…
When was CVE-2026-50635 disclosed?
CVE-2026-50635 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50635 actively exploited?
CVE-2026-50635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50635?
CVE-2026-50635 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-50635?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50635, 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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