How severe is CVE-2020-35313?

CVE-2020-35313 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-2020-35313 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 45% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35313?

CVE-2020-35313 affects Wondercms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35313?

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-2020-35313 published?

CVE-2020-35313 was published on 2021-04-20 and last updated on 2026-06-17.

CVE-2020-35313

CVE-2020-35313 is a critical-severity vulnerability in Wondercms with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 45% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 45% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Wondercms
Published: 2021-04-20
Last modified: 2026-06-17

Description

A server-side request forgery (SSRF) vulnerability in the addCustomThemePluginRepository function in index.php in WonderCMS 3.1.3 allows remote attackers to execute arbitrary code via a crafted URL to the theme/plugin installer.

Frequently asked questions

What is CVE-2020-35313?: A server-side request forgery (SSRF) vulnerability in the addCustomThemePluginRepository function in index.php in WonderCMS 3.1.3 allows remote attackers to execute arbitrary code via a crafted URL to the theme/plugin installer.
How severe is CVE-2020-35313?: CVE-2020-35313 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-2020-35313 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 45% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35313?: CVE-2020-35313 affects Wondercms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35313?: 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-2020-35313 published?: CVE-2020-35313 was published on 2021-04-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wondercms:wondercms:3.1.3:*:*:*:*:*:*:*

More vulnerabilities in Wondercms

CVE-2020-35314 — Critical (CVSS 9.8): A remote code execution vulnerability in the installUpdateThemePluginAction function in index.php in WonderCMS 3.1.3,…
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CVE-2024-32340 — Critical (CVSS 9.6): A cross-site scripting (XSS) vulnerability in the Settings section of WonderCMS v3.4.3 allows attackers to execute…
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CVE-2017-14521 — High (CVSS 8.8): In WonderCMS 2.3.1, the upload functionality accepts random application extensions and leads to malicious File Upload.

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