How severe is CVE-2018-1000641?

CVE-2018-1000641 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-1000641 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1000641?

CVE-2018-1000641 primarily affects Yeswiki. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-1000641?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-1000641 published?

CVE-2018-1000641 was published on 2018-08-20 and last updated on 2026-06-17.

CVE-2018-1000641

Q: What is CVE-2018-1000641?

YesWiki version <= cercopitheque beta 1 contains a PHP Object Injection vulnerability in Unserialising user entered parameter in i18n.inc.php that can result in execution of code, disclosure of information.

CVE-2018-1000641 is a critical-severity vulnerability in Yeswiki with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Yeswiki
Published: 2018-08-20
Last modified: 2026-06-17

Description

YesWiki version <= cercopitheque beta 1 contains a PHP Object Injection vulnerability in Unserialising user entered parameter in i18n.inc.php that can result in execution of code, disclosure of information.

Frequently asked questions

What is CVE-2018-1000641?: YesWiki version <= cercopitheque beta 1 contains a PHP Object Injection vulnerability in Unserialising user entered parameter in i18n.inc.php that can result in execution of code, disclosure of information.
How severe is CVE-2018-1000641?: CVE-2018-1000641 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-1000641 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1000641?: CVE-2018-1000641 primarily affects Yeswiki. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-1000641?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-1000641 published?: CVE-2018-1000641 was published on 2018-08-20 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:yeswiki:yeswiki:2012-10-22-1:*:*:*:*:*:*:*
cpe:2.3:a:yeswiki:yeswiki:2013-10-17-1:*:*:*:*:*:*:*
cpe:2.3:a:yeswiki:yeswiki:2016-03-17-1:*:*:*:*:*:*:*

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