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3 vulnerabilities by Discuz!
CVE-2026-49954 (GCVE-0-2026-49954)
Vulnerability from cvelistv5 – Published: 2026-06-15 18:50 – Updated: 2026-06-16 09:48 X_Open Source
VLAI
Title
Discuz! X5.0 Local File Inclusion via enable_disable.php Plugin Directory
Summary
Discuz! X5.0 releases 20260320 through 20260610 contain a local file inclusion vulnerability that allows authenticated administrators to execute arbitrary code by importing a specially crafted plugin configuration containing path traversal sequences in the directory attribute. Attackers can trigger an exception during plugin installation to bypass sanitization routines, causing malicious paths to be stored unsanitized and subsequently passed to include(), which combined with file upload functionality escalates to arbitrary code execution in the context of the web server user.
Severity
CWE
- CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://karmainsecurity.com/KIS-2026-11 | technical-description |
| https://karmainsecurity.com/chaining-bugs-in-disc… | exploit |
| https://www.vulncheck.com/advisories/discuz-x5-0-… | third-party-advisory |
| http://seclists.org/fulldisclosure/2026/Jun/5 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Discuz! | Discuz! X5.0 |
Affected:
20260320 , ≤ 20260610
(date)
|
Date Public
2026-06-13 00:00
Credits
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CVE-2026-49953 (GCVE-0-2026-49953)
Vulnerability from cvelistv5 – Published: 2026-06-15 18:45 – Updated: 2026-06-16 09:48 X_Open Source
VLAI
Title
Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set
Summary
Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-804 - Guessable CAPTCHA
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://karmainsecurity.com/KIS-2026-10 | technical-description |
| https://karmainsecurity.com/chaining-bugs-in-disc… | exploit |
| https://www.vulncheck.com/advisories/discuz-x5-0-… | third-party-advisory |
| http://seclists.org/fulldisclosure/2026/Jun/4 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Discuz! | Discuz! X5.0 |
Affected:
20260320 , ≤ 20260610
(date)
|
Date Public
2026-06-13 00:00
Credits
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CVE-2026-49952 (GCVE-0-2026-49952)
Vulnerability from cvelistv5 – Published: 2026-06-15 18:43 – Updated: 2026-06-16 09:48 X_Open Source
VLAI
Title
Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle
Summary
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.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-323 - Reusing a Nonce, Key Pair in Encryption
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://karmainsecurity.com/KIS-2026-09 | technical-description |
| https://karmainsecurity.com/chaining-bugs-in-disc… | exploit |
| https://gitee.com/Discuz/DiscuzX/commit/9962dad52… | patch |
| https://www.vulncheck.com/advisories/discuz-x5-0-… | third-party-advisory |
| http://seclists.org/fulldisclosure/2026/Jun/3 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Discuz! | Discuz! X5.0 |
Affected:
20260320 , ≤ 20260501
(date)
|
Date Public
2026-05-09 00:00
Credits
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