CVE-2026-50635

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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.

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(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
31%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 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.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
composerlimesurvey/limesurvey—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
limesurvey/limesurvey1.0.4 ... 6.9.0+241218 (741 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 35× 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 261 total refreshes for this CVE.

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

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 July 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 0% probability of exploitation in the next 30 days, which ranks it in the top 68.9% of all scored CVEs.
What is the CVSS score of CVE-2026-50635?
CVE-2026-50635 has a CVSS v3 base score of 8.8 (NVD).
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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