How severe is CVE-2020-35240?

CVE-2020-35240 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-35240 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35240?

CVE-2020-35240 affects Fluxbb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35240?

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

When was CVE-2020-35240 published?

CVE-2020-35240 was published on 2020-12-30 and last updated on 2026-06-17.

CVE-2020-35240

CVE-2020-35240 is a medium-severity vulnerability in Fluxbb with a CVSS 3.x base score of 4.8. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fluxbb
Published: 2020-12-30
Last modified: 2026-06-17

Description

FluxBB 1.5.11 is affected by cross-site scripting (XSS in the Blog Content component. This vulnerability can allow an attacker to inject the XSS payload in "Blog Content" and each time any user will visit the blog, the XSS triggers and the attacker can able to steal the cookie according to the crafted payload.

Frequently asked questions

What is CVE-2020-35240?: FluxBB 1.5.11 is affected by cross-site scripting (XSS in the Blog Content component. This vulnerability can allow an attacker to inject the XSS payload in "Blog Content" and each time any user will visit the blog, the XSS triggers and the attacker can able to steal the cookie according to the crafted payload.
How severe is CVE-2020-35240?: CVE-2020-35240 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-35240 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35240?: CVE-2020-35240 affects Fluxbb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35240?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35240 published?: CVE-2020-35240 was published on 2020-12-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fluxbb:fluxbb:1.5.11:*:*:*:*:*:*:*

More vulnerabilities in Fluxbb

CVE-2011-3621 — Critical (CVSS 9.8): A reverse proxy issue exists in FluxBB before 1.4.7 when FORUM_BEHIND_REVERSE_PROXY is enabled.
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CVE-2020-28873 — High (CVSS 7.5): Fluxbb 1.5.11 is affected by a denial of service (DoS) vulnerability by sending an extremely long password via the user…
CVE-2014-10029 — High (CVSS 7.5): SQL injection vulnerability in profile.php in FluxBB before 1.4.13 and 1.5.x before 1.5.7 allows remote attackers to…
CVE-2021-43677 — Medium (CVSS 6.1): Fluxbb v1.4.12 is affected by a Cross Site Scripting (XSS) vulnerability.
CVE-2014-10030 — Medium (CVSS 5.8): Open redirect vulnerability in forums/login.php in FluxBB before 1.4.13 and 1.5.x before 1.5.7 allows remote attackers…

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