How severe is CVE-2017-5542?

CVE-2017-5542 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-2017-5542 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-5542?

CVE-2017-5542 affects Getsymphony Symphony. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-5542?

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

When was CVE-2017-5542 published?

CVE-2017-5542 was published on 2017-01-20 and last updated on 2026-06-17.

CVE-2017-5542

CVE-2017-5542 is a medium-severity vulnerability in Getsymphony Symphony 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% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Getsymphony Symphony
Published: 2017-01-20
Last modified: 2026-06-17

Description

Cross-site scripting (XSS) vulnerability in template/usererror.missing_extension.php in Symphony CMS before 2.6.10 allows remote attackers to inject arbitrary web script or HTML via the existing-folder parameter.

Frequently asked questions

What is CVE-2017-5542?: Cross-site scripting (XSS) vulnerability in template/usererror.missing_extension.php in Symphony CMS before 2.6.10 allows remote attackers to inject arbitrary web script or HTML via the existing-folder parameter.
How severe is CVE-2017-5542?: CVE-2017-5542 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-2017-5542 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-5542?: CVE-2017-5542 affects Getsymphony Symphony. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-5542?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-5542 published?: CVE-2017-5542 was published on 2017-01-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:getsymphony:symphony:*:*:*:*:*:*:*:*

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