CVE-2015-5520: Cross-site scripting (XSS) vulnerability in the Users module in Orchard 1.7.3 through 1.8.2 and 1.9.x before 1

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MEDIUM 4.3DOWNGRADE

CVE-2015-5520 is a medium-severity flaw (CVSS 4.3) affecting orchard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the Users module in Orchard 1.7.3 through 1.8.2 and 1.9.x before 1.9.1 allows remote attackers to inject arbitrary web script or HTML via the username when creating a new user account, which is not properly handled when deleting an account.

Why this priority

EPSS top 10%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	4.0% (top 10%)
CISA exploited list	No
Weakness	CWE-79
Published	2015-07-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: orchardproject

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

Am I affected?

Timeline

2015-07-14 16:59 UTCPublished CVE record published
2026-06-17 00:29 UTCUpdated Record last modified

orchardproject orchard DOWNGRADE

Affected: 1.7.3 · 1.8 · 1.8.1 · 1.8.2 · 1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.3 (Debian / Ubuntu)

apt-cache madison orchard sudo apt install orchard=<VERSION_BEFORE_1.7.3> sudo apt-mark hold orchard

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list orchard sudo dnf downgrade orchard-<VERSION_BEFORE_1.7.3> sudo dnf versionlock add orchard

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Orchard CMS 1.7.3/1.8.2/1.9.0 - Persistent Cross-Site Scripting

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-2015-5520?

orchard: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-5520 being exploited?

CVE-2015-5520 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-2015-5520 affect?

CVE-2015-5520 affects orchard. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the Users module in Orchard 1.7.3 through 1.8.2 and 1.9.x before 1.9.1 allows remote attackers to inject arbitrary web script or HTML via the username when creating a new user account, which is no

How urgent is CVE-2015-5520?

Priority 43/100. EPSS top 10%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2020-29593 MEDIUM 5.4 UPGRADE An issue was discovered in Orchard before 1.10
CVE-2020-29592 CRITICAL 9.8 UPGRADE An issue was discovered in Orchard before 1.10
CVE-2013-3645 MEDIUM 4.3 UPGRADE Cross-site scripting (XSS) vulnerability in the Orchard.Comments module in Orchard before 1.6.1 allows remote
CVE-2011-5252 MEDIUM 5.8 DOWNGRADE Open redirect vulnerability in Users/Account/LogOff in Orchard 1.0.x before 1.0.21, 1.1.x before 1.1.31, 1.2.x

References

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