CVE-2019-17488: b3log Symphony (aka Sym) before 3.6.0 has XSS via the HTTP User-Agent header.

Q: How do I fix CVE-2019-17488?

symphony: upgrade to 3.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-17488 being exploited?

CVE-2019-17488 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-17488 affect?

CVE-2019-17488 affects symphony. Severity is medium (CVSS 6.1). b3log Symphony (aka Sym) before 3.6.0 has XSS via the HTTP User-Agent header.

Q: How urgent is CVE-2019-17488?

Priority 41/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2019-17488 is a medium-severity flaw (CVSS 6.1) affecting symphony. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

b3log Symphony (aka Sym) before 3.6.0 has XSS via the HTTP User-Agent header.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-10-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: b3log

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-10-10 21:15 UTCPublished CVE record published
2026-06-17 02:23 UTCUpdated Record last modified

b3log symphony UPGRADE

Affected: < 3.6.0

Fixed in: 3.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy symphony || rpm -q symphony || symphony --version

2. UPGRADE to 3.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade symphony

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade symphony

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-17488?

symphony: upgrade to 3.6.0. Exact commands for each OS are on this page.

Is CVE-2019-17488 being exploited?

CVE-2019-17488 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-17488 affect?

CVE-2019-17488 affects symphony. Severity is medium (CVSS 6.1). b3log Symphony (aka Sym) before 3.6.0 has XSS via the HTTP User-Agent header.

How urgent is CVE-2019-17488?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2020-25912 CRITICAL 9.1 DOWNGRADE A XML External Entity (XXE) vulnerability was discovered in symphony\lib\toolkit\class.xmlelement.php in Symph
CVE-2020-25343 MEDIUM 5.4 DOWNGRADE Cross-site scripting (XSS) vulnerabilities in Symphony CMS 3.0.0 allow remote attackers to inject arbitrary we
CVE-2020-17405 HIGH 8.8 DOWNGRADE This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Se
CVE-2020-15071 MEDIUM 6.1 DOWNGRADE content/content.blueprintsevents.php in Symphony CMS 3.0.0 allows XSS via fields['name'] to appendSubheading.
CVE-2019-9142 MEDIUM 6.1 UPGRADE An issue was discovered in b3log Symphony (aka Sym) before v3.4.7

References

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