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
Elevated
9.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.7%CVSS: 9.1Exploit: Elevated riskExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

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
9.1CRITICALmedium confidence
EG Risk
72
EG Risk 72/100

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%
EPSS PROB
3.7%
EPSS %ILE
89th
KEV
Not listed

Published

June 15, 2026

Last Modified

July 28, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
🔬 Proof of concept available. Fix referenced — no release 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 7× in last 7d / 24× 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 454 total refreshes for this CVE.

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

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 ↗

Related CVEs(same CWE)

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 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 3.7% probability of exploitation in the next 30 days (89th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49952?
CVE-2026-49952 has a CVSS base score of 9.1 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-49952?
A fix for CVE-2026-49952 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-49952 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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