CVE-2026-40497

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Source

https://cve.org/CVERecord?id=CVE-2026-40497

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40497.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-40497

Aliases

GHSA-fh99-wr77-pxq3

Published

2026-04-21T01:45:55.492Z

Modified

2026-07-08T08:13:12.546311790Z

Severity

8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N CVSS Calculator

Summary

FreeScout Vulnerable to CSS Injection via Stored Style Tag in Mailbox Signature (CSRF Token Exfiltration)

Details

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's Helper::stripDangerousTags() removes <script>, <form>, <iframe>, <object> but does NOT strip <style> tags. The mailbox signature field is saved via POST /mailbox/settings/{id} and later rendered unescaped via {!! $conversation->getSignatureProcessed([], true) !!} in conversation views. CSP allows style-src * 'self' 'unsafe-inline', so injected inline styles execute freely. An attacker with access to mailbox settings (admin or agent with mailbox permission) can inject CSS attribute selectors to exfiltrate the CSRF token of any agent/admin who views a conversation in that mailbox. With the CSRF token, the attacker can perform any state-changing action as the victim (create admin accounts, change email/password, etc.) — privilege escalation from agent to admin. This is the result of an incomplete fix of GHSA-jqjf-f566-485j. That advisory reported XSS via mailbox signature. The fix applied Helper::stripDangerousTags() to the signature before saving. However, stripDangerousTags() only removes script, form, iframe, and object tags — it does NOT strip <style> tags, leaving CSS injection possible. Version 1.8.213 contains an updated fix.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40497.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ]
}

References

Affected packages

Git / github.com/freescout-help-desk/freescout

Affected ranges

Type

GIT

Repo

https://github.com/freescout-help-desk/freescout

Events

Introduced

Fixed

acf57a7a4b19544641523c6f7e51b1035c03c9b6

Fixed

5aa8d633216f65995e80a7d4a921b784acc94df4

Database specific

{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.213"
        }
    ]
}

Affected versions

1.*

1.0.0

1.0.2

1.0.3

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.0.9

1.1.0

1.1.1

1.1.10

1.1.2

1.1.3

1.1.4

1.1.5

1.1.6

1.1.7

1.1.8

1.1.9

1.2.0

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.2.6

1.3.0

1.3.1

1.3.10

1.3.11

1.3.12

1.3.13

1.3.14

1.3.15

1.3.16

1.3.17

1.3.18

1.3.19

1.3.2

1.3.3

1.3.4

1.3.5

1.3.6

1.3.7

1.3.8

1.3.9

1.4.0

1.4.1

1.4.10

1.4.11

1.4.12

1.4.2

1.4.3

1.4.4

1.4.6

1.4.7

1.4.8

1.4.9

1.5.0

1.5.1

1.5.10

1.5.11

1.5.12

1.5.13

1.5.14

1.5.15

1.5.2

1.5.3

1.5.4

1.5.5

1.5.6

1.5.7

1.5.8

1.5.9

1.6.0

1.6.1

1.6.10

1.6.11

1.6.12

1.6.13

1.6.14

1.6.15

1.6.16

1.6.17

1.6.18

1.6.19

1.6.2

1.6.20

1.6.3

1.6.4

1.6.5

1.6.6

1.6.7

1.6.8

1.6.9

1.7.0

1.7.1

1.7.10

1.7.11

1.7.12

1.7.13

1.7.14

1.7.15

1.7.16

1.7.17

1.7.18

1.7.19

1.7.2

1.7.20

1.7.21

1.7.22

1.7.23

1.7.24

1.7.25

1.7.26

1.7.27

1.7.28

1.7.29

1.7.3

1.7.30

1.7.4

1.7.5

1.7.6

1.7.7

1.7.9

1.8.0

1.8.1

1.8.10

1.8.100

1.8.101

1.8.102

1.8.103

1.8.104

1.8.105

1.8.106

1.8.107

1.8.108

1.8.109

1.8.11

1.8.110

1.8.111

1.8.112

1.8.113

1.8.114

1.8.115

1.8.116

1.8.117

1.8.118

1.8.119

1.8.12

1.8.120

1.8.121

1.8.122

1.8.123

1.8.124

1.8.125

1.8.126

1.8.127

1.8.128

1.8.129

1.8.13

1.8.130

1.8.131

1.8.132

1.8.133

1.8.134

1.8.135

1.8.136

1.8.137

1.8.138

1.8.139

1.8.14

1.8.140

1.8.141

1.8.142

1.8.143

1.8.144

1.8.145

1.8.146

1.8.147

1.8.148

1.8.149

1.8.15

1.8.150

1.8.151

1.8.152

1.8.153

1.8.154

1.8.155

1.8.156

1.8.157

1.8.158

1.8.159

1.8.16

1.8.160

1.8.161

1.8.162

1.8.163

1.8.164

1.8.165

1.8.166

1.8.167

1.8.168

1.8.169

1.8.17

1.8.170

1.8.171

1.8.172

1.8.173

1.8.174

1.8.175

1.8.176

1.8.177

1.8.178

1.8.179

1.8.18

1.8.180

1.8.181

1.8.182

1.8.183

1.8.184

1.8.185

1.8.186

1.8.187

1.8.188

1.8.189

1.8.19

1.8.190

1.8.191

1.8.192

1.8.193

1.8.194

1.8.195

1.8.196

1.8.197

1.8.198

1.8.199

1.8.2

1.8.20

1.8.200

1.8.201

1.8.202

1.8.203

1.8.204

1.8.205

1.8.206

1.8.207

1.8.208

1.8.209

1.8.21

1.8.210

1.8.211

1.8.212

1.8.22

1.8.23

1.8.24

1.8.25

1.8.26

1.8.27

1.8.28

1.8.29

1.8.3

1.8.30

1.8.31

1.8.32

1.8.33

1.8.34

1.8.35

1.8.36

1.8.37

1.8.38

1.8.39

1.8.4

1.8.40

1.8.41

1.8.42

1.8.43

1.8.44

1.8.45

1.8.46

1.8.47

1.8.48

1.8.49

1.8.5

1.8.50

1.8.51

1.8.52

1.8.53

1.8.54

1.8.55

1.8.56

1.8.57

1.8.58

1.8.59

1.8.6

1.8.60

1.8.61

1.8.62

1.8.63

1.8.65

1.8.66

1.8.67

1.8.68

1.8.69

1.8.7

1.8.70

1.8.71

1.8.72

1.8.73

1.8.74

1.8.75

1.8.76

1.8.77

1.8.78

1.8.79

1.8.8

1.8.80

1.8.81

1.8.82

1.8.83

1.8.84

1.8.85

1.8.86

1.8.87

1.8.88

1.8.89

1.8.9

1.8.90

1.8.91

1.8.92

1.8.93

1.8.94

1.8.95

1.8.96

1.8.97

1.8.98

1.8.99

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40497.json"