CVE-2018-1000841: Zend.To version Prior to 5.15-1 contains a Cross Site Scripting (XSS) vulnerability in The verify.php page tha

Q: How do I fix CVE-2018-1000841?

zendto: upgrade to 5.15-1. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000841 being exploited?

CVE-2018-1000841 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-2018-1000841 affect?

CVE-2018-1000841 affects zendto. Severity is medium (CVSS 6.1). Zend.To version Prior to 5.15-1 contains a Cross Site Scripting (XSS) vulnerability in The verify.php page that can result in An attacker could execute arbitrary Javascript code in the context of the victim's browser.. This attack appear to

Q: How urgent is CVE-2018-1000841?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2018-1000841 is a medium-severity flaw (CVSS 6.1) affecting zendto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Zend.To version Prior to 5.15-1 contains a Cross Site Scripting (XSS) vulnerability in The verify.php page that can result in An attacker could execute arbitrary Javascript code in the context of the victim's browser.. This attack appear to be exploitable via HTTP POST request. This vulnerability appears to have been fixed in 5.16-1 Beta.

Why this priority

No elevated risk signals yet

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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zend

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

Am I affected?

Timeline

2018-12-20 15:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

zend zendto UPGRADE

Affected: < 5.15-1

Fixed in: 5.15-1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 5.15-1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zendto

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-2018-1000841?

zendto: upgrade to 5.15-1. Exact commands for each OS are on this page.

Is CVE-2018-1000841 being exploited?

CVE-2018-1000841 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-2018-1000841 affect?

CVE-2018-1000841 affects zendto. Severity is medium (CVSS 6.1). Zend.To version Prior to 5.15-1 contains a Cross Site Scripting (XSS) vulnerability in The verify.php page that can result in An attacker could execute arbitrary Javascript code in the context of the victim's browser.. This attack appear to

How urgent is CVE-2018-1000841?

Priority 35/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-8986 CRITICAL 9.8 DOWNGRADE lib/NSSDropbox.php in ZendTo prior to 5.22-2 Beta failed to properly check for equality when validating the se
CVE-2020-8985 HIGH 8.8 DOWNGRADE ZendTo prior to 5.22-2 Beta allowed reflected XSS and CSRF via the unlock.tpl unlock user functionality.
CVE-2020-8984 HIGH 7.5 DOWNGRADE lib/NSSDropbox.php in ZendTo prior to 5.22-2 Beta allowed IP address spoofing via the X-Forwarded-For header.

References

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