How severe is CVE-2021-25878?

CVE-2021-25878 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25878?

CVE-2021-25878 affects Youphptube. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25878?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-25878 published?

CVE-2021-25878 was published on 2021-11-01 and last updated on 2026-07-05.

CVE-2021-25878

CVE-2021-25878 is a medium-severity vulnerability in Youphptube with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Youphptube
Published: 2021-11-01
Last modified: 2026-07-05

Description

AVideo/YouPHPTube 10.0 and prior is affected by multiple reflected Cross Script Scripting vulnerabilities via the videoName parameter which allows a remote attacker to steal administrators' session cookies or perform actions as an administrator.

Frequently asked questions

What is CVE-2021-25878?: AVideo/YouPHPTube 10.0 and prior is affected by multiple reflected Cross Script Scripting vulnerabilities via the videoName parameter which allows a remote attacker to steal administrators' session cookies or perform actions as an administrator.
How severe is CVE-2021-25878?: CVE-2021-25878 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25878?: CVE-2021-25878 affects Youphptube. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25878?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25878 published?: CVE-2021-25878 was published on 2021-11-01 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:youphptube:youphptube:*:*:*:*:*:*:*:*

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