CVE-2026-49952

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-15. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 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
—
EPSS
68.5%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 16, 2026

Advisory Details (4)

Auto-updated Jun 15, 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 13× in last 7d / 167× 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 227 total refreshes for this CVE.

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

Publicly available exploits

(2 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 ↗

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 June 16, 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 68.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49952?
CVE-2026-49952 has a CVSS v3 base score of 9.1 (NVD).
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

Explore →

Is Your Infrastructure Affected by CVE-2026-49952?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs