CVE-2026-49952

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-15. the CNA's CVSS baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 9.1Exploit: Elevated riskExposed: 0

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

Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
5%
EPSS %ILE
91%
KEV
Not listed

Published

June 15, 2026

Last Modified

July 28, 2026

Advisory Details (4)

Auto-updated Aug 1, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle | Advisories | VulnCheck

https://www.vulncheck.com/advisories/discuz-x5-0-authentication-bypass-via-dbbak-php-encryption-oracle
generic

Login - Gitee.com

https://gitee.com/Discuz/DiscuzX/commit/9962dad52c4c6999dabaf91ecd70377c680ff3c6
generic🟡 PoC Available

Chaining Security Bugs in Discuz! X5.0: from Race Condition to Pre-Auth RCE | Karma(In)Security

https://karmainsecurity.com/chaining-bugs-in-discuz-from-race-condition-to-rce
generic🟡 PoC Available

Discuz! X5.0 (UC_KEY) Cross-Context Token Reuse Vulnerability | Karma(In)Security

https://karmainsecurity.com/KIS-2026-09

Vendor Advisories for CVE-2026-49952(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 29× in last 7d / 181× 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 416 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52621
    First seen Jul 7, 2026

    Discuz! X5.0 - Authentication Bypass

    Open source ↗
  • GitHub PoCpasswa11/CVE-2026-49952
    First seen Jun 17, 2026

    Chaining Security Bugs in Discuz! X5.0: from Race Condition to Pre-Auth RCE

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-49952.yaml
    First seen Jan 1, 2026

    Discuz! X5.0 - Authentication Bypass

    Open source ↗

Frequently asked(5)

What is CVE-2026-49952?
CVE-2026-49952 is a critical vulnerability published on June 15, 2026. Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database…
When was CVE-2026-49952 disclosed?
CVE-2026-49952 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49952 actively exploited?
CVE-2026-49952 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.9% of all scored CVEs.
What is the CVSS score of CVE-2026-49952?
CVE-2026-49952 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-49952?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49952, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-49952

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