VulnSocial

CVE-2026-52778Patch

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, an unsafe execution vulnerability exists in the Bazar form field calculator (CalcField.php) of YesWiki. The application attempts to sanitize user-defined mathematical formulas using a complex recursive regular expression before passing them to the PHP eval() function. This implementation is inherently flawed: it is vulnerable to Regular Expression Denial of Service (ReDoS / Stack Overflow) which can crash the server, and it creates a high-risk architecture where any logic bypass directly results in arbitrary PHP code execution. Version 4.6.6 patches the issue.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-94CWE-1333

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 3 signals
  • Technical details provided in 3 signals
  • Peaked 1d ago at 2 mentions (2026-06-09); latest day: 1
  • 3 total mentions across 2 days

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-06-09: 2Mentions · 2026-06-13: 1Patch / Workaround · 2026-06-09: 2Patch / Workaround · 2026-06-13: 1Technical Details · 2026-06-09: 2Technical Details · 2026-06-13: 106-0906-13
Signal classification1 categories
Patch
3100.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-06-092
Patch2
2026-06-131
Patch1
Full discourse3 posts
  • SecAlerts@SecAlertsCo
    Patch

    🧮 CVE-2026-52778: YesWiki's formula calculator uses unsafe eval() — unauthenticated RCE + DoS, CVSS 9.8. No auth, no interaction needed. Patch to v4.6.6 now. https://secalerts.co/vulnerability/CVE-2026-52778 https://t.co/ThlpQTgzYo

    Post summary

    Vulnerability in YesWiki’s formula calculator allows unauthenticated Remote Code Execution and DoS (CVSS 9.8); a fix (v4.6.6) is now available.

    0000075
    835 followersView on X
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Patch

    CVE-2026-52778 - Critical ReDoS in YesWiki. Unpatched flaw in CalcField.php allows crash via regex denial of service on eval(). CVSS 9.8. Upgrade to 4.6.6 immediately. #CVE #YesWiki #InfoSec #CyberCommunity A #cybersecurity heaven https://www.valtersit.com/cve/CVE-2026-52778/

    Post summary

    The post announces a critical ReDoS vulnerability in YesWiki (CVE-2026-52778) and urges users to upgrade to version 4.6.6, providing technical details and a CVSS score.

    0000045
    921 followersView on X
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Patch

    CVE-2026-52778 - Critical ReDoS in YesWiki. Unpatched flaw in CalcField.php allows crash via regex denial of service on eval(). CVSS 9.8. Upgrade to 4.6.6 immediately. #CVE #YesWiki #InfoSec #cybersecurity #hackers #hacking https://www.valtersit.com/cve/CVE-2026-52778

    Post summary

    A critical ReDoS flaw (CVSS 9.8) exists in YesWiki's CalcField.php; users are urged to upgrade to version 4.6.6 to mitigate the vulnerability.

    0000042
    921 followersView on X

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